<template>
  <div>
    <div class="goods">
      <div class="menu-wrapper" ref="menuWrapper">
        <ul>
          <li v-for="(item,index) in goods"
              class="menu-item"
              :class="{'current':currentIndex === index}"
              @click="selectMenu(index)"
          >
          <span class="text border-1px">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>
          {{item.name}}</span>
          </li>
        </ul>
      </div>
      <div class="foods-wrapper" ref="foodWrapper">
        <ul>
          <li v-for="item in goods" class="food-list food-list-hood">
            <h1 class="title">{{item.name}}</h1>
            <ul>
              <li v-for="food in item.foods" class="food-item border-1px" @click="selectFood(food, $event)">
                <div class="icon" >
                  <img  v-lazy="food.icon" alt="" width="57" height="57">
                </div>
                <div class="content">
                  <h2 class="name">{{food.name}}</h2>
                  <p class="desc">{{food.description}}</p>
                  <div class="extra">
                    <span class="count">月售{{food.sellCount}}份</span>
                    <span>好评率{{food.rating}}%</span>
                  </div>
                  <div class="price">
                    <span class="now">￥{{food.price}}</span>
                    <span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                  </div>
                  <div class="cart-wrapper">
                    <cart-conrtrol :food="food"></cart-conrtrol>
                  </div>
                </div>
              </li>
            </ul>
          </li>
        </ul>
      </div>
      <shop-card :selectFoods='selectFoods'
                 :deliveryPrice="seller.deliveryPrice"
                 :minPrice="seller.minPrice"
      >

      </shop-card>
    </div>
    <food :food="selectfood"></food>
  </div>
</template>

<script>
  const ERR_OK = 0;
  import BScroll from 'better-scroll';
  import shopCard from 'components/shopCard/shopCard';
  import cartConrtrol from 'components/cartcortrol/cartcortrol';
  import food from 'components/food/food'

  export default {
    props: {
      seller: {
        type: Object
      }
    },
    created() {
      // 接收food组件里面发送的show方法
      this.Event.$on('show', (els) => {
        this.show = els;
      });
      /* eslint-disable*/
      this.$http.get('/api/goods').then((response) => {
        if (response.data.errno === ERR_OK) {
          this.goods = response.data.data;
          console.log(this.goods)
        }
      });
      // 这里可以单独出来作为组件
      this.classMap = ['decrease', 'discount', 'guarantee', 'invoice', 'special'];
      this.$nextTick(() => {
        setTimeout(() => {
          this._initScroll();
          // 获取列表的高度
          this._calculateHeight()
        }, 20);
      });
    },
    methods: {
      selectFood(food, el) {
        this.selectfood = food;
        this.show()
      },
      selectMenu(index) {
        let foodList = this.$refs.foodWrapper.getElementsByClassName('food-list-hood');
        let el = foodList[index];
        this.foodScroll.scrollToElement(el, 300);
      },
      // 初始化 BScorll
      _initScroll() {
        this.menScroll = new BScroll(this.$refs.menuWrapper, {
          probeType: 3,
          click: true
        });
        this.foodScroll = new BScroll(this.$refs.foodWrapper, {
          probeType: 3,
          click: true
        });
        this.foodScroll.on('scroll', (pos) => {
          this.scrollY = Math.abs(Math.round(pos.y));
        })
      },
      // 获取列表的高度
      _calculateHeight() {
        let foodList = this.$refs.foodWrapper.getElementsByClassName('food-list-hood');
        let height = 0;
        this.listHeight.push(height);
        for (let i = 0; i < foodList.length; i++) {
          let item = foodList[i];
          height += item.clientHeight;
          this.listHeight.push(height)
        }
      }
    },
    computed: {
      currentIndex() {
        for (let i = 0; i < this.listHeight.length; i++) {
          let height1 = this.listHeight[i];
          let height2 = this.listHeight[i + 1];
          if (this.scrollY >= height1 && this.scrollY < height2) {
            return i
          }
        }
        return 0;
      },
      selectFoods() {
        let foods = [];
        this.goods.forEach((good) => {
          good.foods.forEach((food) => {
            if (food.count) {
              foods.push(food)
            }
          })
        });
        return foods
      }
    },
    data() {
      return {
        goods: [],
        listHeight: [],
        scrollY: 0,
        selectfood: {},
        show: false
      }
    },
    components: {
      shopCard,
      cartConrtrol,
      food
    }

  }
</script>

<style lang="stylus" rel="stylesheet/stylus" scoped>
  @import "../../common/stylus/mixin.styl"

  .goods
    display: flex
    position: absolute
    top: 174px
    width: 100%
    bottom: 46px
    overflow: hidden
    .menu-wrapper
      flex: 0 0 80px
      width: 80px
      background: #f3f5f7
      .menu-item
        display: table
        height: 54px
        width: 56px
        line-height: 14px
        padding: 0 12px
        &.current
          position: relative
          z-index: 18
          margin-top: -1px
          background: #fff;
          font-weight: 700
          .text
            border-none()
        .icon
          display: inline-block
          vertical-align: top
          width: 12px
          height: 12px
          margin-right: 2px
          background-size: 12px 12px
          background-repeat: no-repeat
          &.decrease
            bg-image('decrease_3')
          &.discount
            bg-image('discount_3')
          &.guarantee
            bg-image('guarantee_3')
          &.invoice
            bg-image('invoice_3')
          &.special
            bg-image('special_3')
        .text
          display: table-cell
          width: 56px
          vertical-align: middle
          font-size: 12px
          border-1px(rgba(7, 17, 27, 0.2))
    .foods-wrapper
      flex: 1
      .title
        padding-left: 14px
        height: 26px
        line-height: 26px
        border-left: 2px solid #d9dde1
        font-size: 12px
        color: rgb(147, 153, 159)
        background: #f3f5f7
      .food-item
        display: flex
        margin: 16px
        padding-bottom: 18px
        border-1px(rgba(7, 17, 27, 0.1))
        &:last-child
          border-none()
          margin-bottom: 0
        .icon
          flex: 0 0 57px
          margin-right: 10px
        .content
          flex: 1
          .name
            font-size: 14px
            margin: 2px 0 8px
            height: 14px
            line-height: 14px
            color: rgb(7, 17, 27)
          .desc, .extra
            line-height: 10px
            font-size: 10px
            color: rgb(147, 153, 159)
          .desc
            margin-bottom: 8px
          .extra
            .count
              margin-right: 12px
          .price
            font-weight: 700
            line-height: 24px
            .now
              margin-right: 8px
              font-size: 14px
              color: rgb(240, 20, 20)
            .old
              text-decoration: line-through
              font-size: 10px
              color: rgb(147, 153, 159)
          .cart-wrapper
            position: absolute
            right: 0
            bottom: 12px
</style>
